New Arduino Dock 2 is DOA - will not power on.

I received 3 docks with my Onion Omega2 order and all but the Arduino Dock 2 work as instructed. I am unable to power it using the same micro USB that worked on the other two docks nor a 5V barrel connector. Is there a trick I am missing or could I possibly have a bad dock?

BTW, I am not new to these mico computer/controller devices having owned and developed on Arduino, the Spark-IO platforms (Core, Photon,etc) and Raspberry Pi.

Thanks for any help you can provide before I try returning this dock to Onion.